Surfing teenagers of the "Beach Party" series follow up "Muscle Beach Party" with a third fling at the beach and welcome a visitor, British recording star "Potato Bug" (Avalon in a campy dual role). But, golly gee, wealthy Wynn wants to turn their sandy, surfin' shores into a retirement community. What to do? Sing a few songs, dance in your bathing suits, and have fun. Classic early '60s nostalgia is better than the first two efforts; followed by "Pajama Party."